Quiz for Labs 1 & 2 IPS Study Guide
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REACTION IN A BAG stuff
ELEMENTS
- acidic
- produces heat when in contact avec liquids – exothermic
- absorbs water aussi (AKA Hydrotopic)... (keeps canned food from getting mushy))
Sodium bicarbonate (AKA Solid B or Baking Soda)
- "Takes away heat (energy)" when combined – endothermic
- Not acidic
- USED IN: baking, toothpaste, volcanoes :D, etc
Phenol Red (AKA Red Liquid ≠ Red Water)
- Used as PH Indicator:
- Below 7 (alkaline) = yellow
- Above 7 (Acidic) = pink/red
Everything Combined!!!:
Yellow and Pink stuff, hot and cold, gas also produced
VOCABULARY
Endothermic – losing tempurature
Hydrotropic – absorbs water
Experimental Error:
Heating Baking Soda (stuff)!
Test Tube
Bottle
(Heated) Baking Soda (and Tea)
Vocab and Stuff
Variable: A category you try to measure
Dependant Variable: Color of tea dependant on Baking Soda
Independant Variable: Causes a change in the Dependant Variable (Baking Soda)
Control Factors: Same type of tea; same amount of baking soda used, same amount of tea; same test tube
Control Factor – Unheated Baking SodaExperimental Factor – Heated Baking Soda
Indicator – Tea
Expermental Errors
- Hole in tubing or Stopper "not snug" – gas wont fill bottle
- Not cleaning stirring rod before beginning (cuz of previous class) – contaminate
1.4 Measurement by Displacement of Water
Experimental Errors
- Sand sticks to sides of wet cylinder–different amount
- Pour water into sand–different amount of air
About 40% of airspace takes up "dry sand" volume
1.6 Mass: The Equal-Arm Balance
- Equal-Arm Balance created in Ancient Egypt
- 1 kilogram = 1000 grams
1.8 Sensitivity of the Balance
Data
Each balance can only detect a set amount of weight at a time; balances will vary in sensitivities
Coin History
Coins After 1982 : 2.5% Copper 97.5% Zinc
1943
- Made of Steel + Zinc
- Copper needed for shell casings (WWII;bullets)
- A 1942 COPPER penny is worth $82,500 o_O
- About 10 left in the world
LAB SAFETY AKA Common Sense
Lab Safety
- Test odors of liquids by wafting
- Never waft solids
- If something spills or breaks, tell Mr. Leeds INSTANTANEOUSLY
- Wash hands with soap and water after handling chemicals
- Never use force to remove or insert glass
- Lab area must be clean before leaving class
- Capping the alcohol burner puts out the flame because fire needs oxygen
- Keep your goggles on until Mr. Leeds says to remove them
- Nurse extension – 2828
- Keep hair up (if you have long hair)
- Roll up your sleeves
- Don't abandon/leave a lit burner
- Don't taste chemicals
- Don't touch chemicals directly
Safety Equipment
- Fire Extinguisher–puts out a fire
- Fire Blanket–crawling with fire-resistant bacteria, wrap around someone on fire and it will help put fire out
- Eye wash/shower–self-explanatory... like fire extinguisher ._.
METRIC SYSTEMATIC things
Graduated cylinder measures volume
Standard unit of Length = meters
1ml=1cm(cubed)